1173 lines
29 KiB
C
1173 lines
29 KiB
C
/* The industrial I/O core
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*
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* Copyright (c) 2008 Jonathan Cameron
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*
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* Based on elements of hwmon and input subsystems.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/idr.h>
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#include <linux/kdev_t.h>
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#include <linux/err.h>
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#include <linux/device.h>
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#include <linux/fs.h>
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#include <linux/poll.h>
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#include <linux/sched.h>
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#include <linux/wait.h>
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#include <linux/cdev.h>
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#include <linux/slab.h>
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#include <linux/anon_inodes.h>
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#include "iio.h"
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#include "iio_core.h"
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#include "iio_core_trigger.h"
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#include "sysfs.h"
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#include "events.h"
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/* IDA to assign each registered device a unique id*/
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static DEFINE_IDA(iio_ida);
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static dev_t iio_devt;
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#define IIO_DEV_MAX 256
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struct bus_type iio_bus_type = {
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.name = "iio",
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};
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EXPORT_SYMBOL(iio_bus_type);
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static const char * const iio_data_type_name[] = {
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[IIO_RAW] = "raw",
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[IIO_PROCESSED] = "input",
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};
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static const char * const iio_direction[] = {
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[0] = "in",
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[1] = "out",
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};
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static const char * const iio_chan_type_name_spec[] = {
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[IIO_VOLTAGE] = "voltage",
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[IIO_CURRENT] = "current",
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[IIO_POWER] = "power",
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[IIO_ACCEL] = "accel",
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[IIO_ANGL_VEL] = "anglvel",
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[IIO_MAGN] = "magn",
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[IIO_LIGHT] = "illuminance",
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[IIO_INTENSITY] = "intensity",
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[IIO_PROXIMITY] = "proximity",
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[IIO_TEMP] = "temp",
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[IIO_INCLI] = "incli",
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[IIO_ROT] = "rot",
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[IIO_ANGL] = "angl",
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[IIO_TIMESTAMP] = "timestamp",
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[IIO_CAPACITANCE] = "capacitance",
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};
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static const char * const iio_modifier_names[] = {
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[IIO_MOD_X] = "x",
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[IIO_MOD_Y] = "y",
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[IIO_MOD_Z] = "z",
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[IIO_MOD_LIGHT_BOTH] = "both",
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[IIO_MOD_LIGHT_IR] = "ir",
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};
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/* relies on pairs of these shared then separate */
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static const char * const iio_chan_info_postfix[] = {
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[IIO_CHAN_INFO_SCALE] = "scale",
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[IIO_CHAN_INFO_OFFSET] = "offset",
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[IIO_CHAN_INFO_CALIBSCALE] = "calibscale",
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[IIO_CHAN_INFO_CALIBBIAS] = "calibbias",
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[IIO_CHAN_INFO_PEAK] = "peak_raw",
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[IIO_CHAN_INFO_PEAK_SCALE] = "peak_scale",
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[IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW] = "quadrature_correction_raw",
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[IIO_CHAN_INFO_AVERAGE_RAW] = "mean_raw",
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[IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY]
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= "filter_low_pass_3db_frequency",
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};
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/**
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* struct iio_detected_event_list - list element for events that have occurred
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* @list: linked list header
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* @ev: the event itself
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*/
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struct iio_detected_event_list {
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struct list_head list;
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struct iio_event_data ev;
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};
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/**
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* struct iio_event_interface - chrdev interface for an event line
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* @dev: device assocated with event interface
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* @wait: wait queue to allow blocking reads of events
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* @event_list_lock: mutex to protect the list of detected events
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* @det_events: list of detected events
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* @max_events: maximum number of events before new ones are dropped
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* @current_events: number of events in detected list
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* @flags: file operations related flags including busy flag.
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*/
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struct iio_event_interface {
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wait_queue_head_t wait;
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struct mutex event_list_lock;
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struct list_head det_events;
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int max_events;
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int current_events;
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struct list_head dev_attr_list;
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unsigned long flags;
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struct attribute_group group;
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};
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int iio_push_event(struct iio_dev *indio_dev, u64 ev_code, s64 timestamp)
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{
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struct iio_event_interface *ev_int = indio_dev->event_interface;
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struct iio_detected_event_list *ev;
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int ret = 0;
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/* Does anyone care? */
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mutex_lock(&ev_int->event_list_lock);
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if (test_bit(IIO_BUSY_BIT_POS, &ev_int->flags)) {
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if (ev_int->current_events == ev_int->max_events) {
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mutex_unlock(&ev_int->event_list_lock);
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return 0;
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}
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ev = kmalloc(sizeof(*ev), GFP_KERNEL);
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if (ev == NULL) {
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ret = -ENOMEM;
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mutex_unlock(&ev_int->event_list_lock);
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goto error_ret;
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}
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ev->ev.id = ev_code;
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ev->ev.timestamp = timestamp;
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list_add_tail(&ev->list, &ev_int->det_events);
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ev_int->current_events++;
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mutex_unlock(&ev_int->event_list_lock);
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wake_up_interruptible(&ev_int->wait);
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} else
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mutex_unlock(&ev_int->event_list_lock);
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error_ret:
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return ret;
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}
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EXPORT_SYMBOL(iio_push_event);
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/* This turns up an awful lot */
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ssize_t iio_read_const_attr(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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return sprintf(buf, "%s\n", to_iio_const_attr(attr)->string);
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}
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EXPORT_SYMBOL(iio_read_const_attr);
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static ssize_t iio_event_chrdev_read(struct file *filep,
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char __user *buf,
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size_t count,
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loff_t *f_ps)
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{
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struct iio_event_interface *ev_int = filep->private_data;
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struct iio_detected_event_list *el;
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size_t len = sizeof(el->ev);
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int ret;
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if (count < len)
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return -EINVAL;
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mutex_lock(&ev_int->event_list_lock);
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if (list_empty(&ev_int->det_events)) {
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if (filep->f_flags & O_NONBLOCK) {
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ret = -EAGAIN;
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goto error_mutex_unlock;
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}
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mutex_unlock(&ev_int->event_list_lock);
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/* Blocking on device; waiting for something to be there */
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ret = wait_event_interruptible(ev_int->wait,
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!list_empty(&ev_int
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->det_events));
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if (ret)
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goto error_ret;
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/* Single access device so no one else can get the data */
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mutex_lock(&ev_int->event_list_lock);
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}
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el = list_first_entry(&ev_int->det_events,
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struct iio_detected_event_list,
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list);
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if (copy_to_user(buf, &(el->ev), len)) {
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ret = -EFAULT;
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goto error_mutex_unlock;
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}
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list_del(&el->list);
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ev_int->current_events--;
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mutex_unlock(&ev_int->event_list_lock);
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kfree(el);
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return len;
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error_mutex_unlock:
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mutex_unlock(&ev_int->event_list_lock);
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error_ret:
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return ret;
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}
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static int iio_event_chrdev_release(struct inode *inode, struct file *filep)
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{
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struct iio_event_interface *ev_int = filep->private_data;
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struct iio_detected_event_list *el, *t;
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mutex_lock(&ev_int->event_list_lock);
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clear_bit(IIO_BUSY_BIT_POS, &ev_int->flags);
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/*
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* In order to maintain a clean state for reopening,
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* clear out any awaiting events. The mask will prevent
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* any new __iio_push_event calls running.
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*/
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list_for_each_entry_safe(el, t, &ev_int->det_events, list) {
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list_del(&el->list);
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kfree(el);
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}
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ev_int->current_events = 0;
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mutex_unlock(&ev_int->event_list_lock);
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return 0;
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}
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static const struct file_operations iio_event_chrdev_fileops = {
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.read = iio_event_chrdev_read,
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.release = iio_event_chrdev_release,
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.owner = THIS_MODULE,
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.llseek = noop_llseek,
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};
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static int iio_event_getfd(struct iio_dev *indio_dev)
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{
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int fd;
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if (indio_dev->event_interface == NULL)
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return -ENODEV;
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mutex_lock(&indio_dev->event_interface->event_list_lock);
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if (test_and_set_bit(IIO_BUSY_BIT_POS,
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&indio_dev->event_interface->flags)) {
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mutex_unlock(&indio_dev->event_interface->event_list_lock);
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return -EBUSY;
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}
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mutex_unlock(&indio_dev->event_interface->event_list_lock);
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fd = anon_inode_getfd("iio:event",
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&iio_event_chrdev_fileops,
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indio_dev->event_interface, O_RDONLY);
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if (fd < 0) {
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mutex_lock(&indio_dev->event_interface->event_list_lock);
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clear_bit(IIO_BUSY_BIT_POS, &indio_dev->event_interface->flags);
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mutex_unlock(&indio_dev->event_interface->event_list_lock);
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}
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return fd;
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}
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static int __init iio_init(void)
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{
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int ret;
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/* Register sysfs bus */
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ret = bus_register(&iio_bus_type);
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if (ret < 0) {
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printk(KERN_ERR
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"%s could not register bus type\n",
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__FILE__);
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goto error_nothing;
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}
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ret = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio");
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if (ret < 0) {
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printk(KERN_ERR "%s: failed to allocate char dev region\n",
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__FILE__);
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goto error_unregister_bus_type;
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}
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return 0;
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error_unregister_bus_type:
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bus_unregister(&iio_bus_type);
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error_nothing:
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return ret;
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}
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static void __exit iio_exit(void)
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{
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if (iio_devt)
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unregister_chrdev_region(iio_devt, IIO_DEV_MAX);
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bus_unregister(&iio_bus_type);
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}
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static ssize_t iio_read_channel_info(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct iio_dev *indio_dev = dev_get_drvdata(dev);
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struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
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int val, val2;
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int ret = indio_dev->info->read_raw(indio_dev, this_attr->c,
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&val, &val2, this_attr->address);
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if (ret < 0)
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return ret;
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if (ret == IIO_VAL_INT)
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return sprintf(buf, "%d\n", val);
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else if (ret == IIO_VAL_INT_PLUS_MICRO) {
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if (val2 < 0)
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return sprintf(buf, "-%d.%06u\n", val, -val2);
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else
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return sprintf(buf, "%d.%06u\n", val, val2);
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} else if (ret == IIO_VAL_INT_PLUS_NANO) {
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if (val2 < 0)
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return sprintf(buf, "-%d.%09u\n", val, -val2);
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else
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return sprintf(buf, "%d.%09u\n", val, val2);
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} else
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return 0;
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}
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static ssize_t iio_write_channel_info(struct device *dev,
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struct device_attribute *attr,
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const char *buf,
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size_t len)
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{
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struct iio_dev *indio_dev = dev_get_drvdata(dev);
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struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
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int ret, integer = 0, fract = 0, fract_mult = 100000;
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bool integer_part = true, negative = false;
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/* Assumes decimal - precision based on number of digits */
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if (!indio_dev->info->write_raw)
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return -EINVAL;
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if (indio_dev->info->write_raw_get_fmt)
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switch (indio_dev->info->write_raw_get_fmt(indio_dev,
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this_attr->c, this_attr->address)) {
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case IIO_VAL_INT_PLUS_MICRO:
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fract_mult = 100000;
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break;
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case IIO_VAL_INT_PLUS_NANO:
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fract_mult = 100000000;
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break;
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default:
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return -EINVAL;
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}
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if (buf[0] == '-') {
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negative = true;
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buf++;
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}
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while (*buf) {
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if ('0' <= *buf && *buf <= '9') {
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if (integer_part)
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integer = integer*10 + *buf - '0';
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else {
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fract += fract_mult*(*buf - '0');
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if (fract_mult == 1)
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break;
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fract_mult /= 10;
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}
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} else if (*buf == '\n') {
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if (*(buf + 1) == '\0')
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break;
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else
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return -EINVAL;
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} else if (*buf == '.') {
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integer_part = false;
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} else {
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return -EINVAL;
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}
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buf++;
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}
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if (negative) {
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if (integer)
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integer = -integer;
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else
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fract = -fract;
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}
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ret = indio_dev->info->write_raw(indio_dev, this_attr->c,
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integer, fract, this_attr->address);
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if (ret)
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return ret;
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|
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return len;
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}
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|
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static
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int __iio_device_attr_init(struct device_attribute *dev_attr,
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const char *postfix,
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struct iio_chan_spec const *chan,
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ssize_t (*readfunc)(struct device *dev,
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struct device_attribute *attr,
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char *buf),
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ssize_t (*writefunc)(struct device *dev,
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struct device_attribute *attr,
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const char *buf,
|
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size_t len),
|
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bool generic)
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{
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int ret;
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char *name_format, *full_postfix;
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sysfs_attr_init(&dev_attr->attr);
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|
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/* Build up postfix of <extend_name>_<modifier>_postfix */
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if (chan->modified && !generic) {
|
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if (chan->extend_name)
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full_postfix = kasprintf(GFP_KERNEL, "%s_%s_%s",
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iio_modifier_names[chan
|
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->channel2],
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chan->extend_name,
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postfix);
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else
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full_postfix = kasprintf(GFP_KERNEL, "%s_%s",
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iio_modifier_names[chan
|
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->channel2],
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postfix);
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} else {
|
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if (chan->extend_name == NULL)
|
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full_postfix = kstrdup(postfix, GFP_KERNEL);
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else
|
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full_postfix = kasprintf(GFP_KERNEL,
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"%s_%s",
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chan->extend_name,
|
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postfix);
|
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}
|
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if (full_postfix == NULL) {
|
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ret = -ENOMEM;
|
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goto error_ret;
|
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}
|
|
|
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if (chan->differential) { /* Differential can not have modifier */
|
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if (generic)
|
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name_format
|
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= kasprintf(GFP_KERNEL, "%s_%s-%s_%s",
|
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iio_direction[chan->output],
|
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iio_chan_type_name_spec[chan->type],
|
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iio_chan_type_name_spec[chan->type],
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full_postfix);
|
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else if (chan->indexed)
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name_format
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= kasprintf(GFP_KERNEL, "%s_%s%d-%s%d_%s",
|
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iio_direction[chan->output],
|
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iio_chan_type_name_spec[chan->type],
|
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chan->channel,
|
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iio_chan_type_name_spec[chan->type],
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chan->channel2,
|
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full_postfix);
|
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else {
|
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WARN_ON("Differential channels must be indexed\n");
|
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ret = -EINVAL;
|
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goto error_free_full_postfix;
|
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}
|
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} else { /* Single ended */
|
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if (generic)
|
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name_format
|
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= kasprintf(GFP_KERNEL, "%s_%s_%s",
|
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iio_direction[chan->output],
|
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iio_chan_type_name_spec[chan->type],
|
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full_postfix);
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else if (chan->indexed)
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name_format
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= kasprintf(GFP_KERNEL, "%s_%s%d_%s",
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iio_direction[chan->output],
|
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iio_chan_type_name_spec[chan->type],
|
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chan->channel,
|
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full_postfix);
|
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else
|
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name_format
|
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= kasprintf(GFP_KERNEL, "%s_%s_%s",
|
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iio_direction[chan->output],
|
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iio_chan_type_name_spec[chan->type],
|
|
full_postfix);
|
|
}
|
|
if (name_format == NULL) {
|
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ret = -ENOMEM;
|
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goto error_free_full_postfix;
|
|
}
|
|
dev_attr->attr.name = kasprintf(GFP_KERNEL,
|
|
name_format,
|
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chan->channel,
|
|
chan->channel2);
|
|
if (dev_attr->attr.name == NULL) {
|
|
ret = -ENOMEM;
|
|
goto error_free_name_format;
|
|
}
|
|
|
|
if (readfunc) {
|
|
dev_attr->attr.mode |= S_IRUGO;
|
|
dev_attr->show = readfunc;
|
|
}
|
|
|
|
if (writefunc) {
|
|
dev_attr->attr.mode |= S_IWUSR;
|
|
dev_attr->store = writefunc;
|
|
}
|
|
kfree(name_format);
|
|
kfree(full_postfix);
|
|
|
|
return 0;
|
|
|
|
error_free_name_format:
|
|
kfree(name_format);
|
|
error_free_full_postfix:
|
|
kfree(full_postfix);
|
|
error_ret:
|
|
return ret;
|
|
}
|
|
|
|
static void __iio_device_attr_deinit(struct device_attribute *dev_attr)
|
|
{
|
|
kfree(dev_attr->attr.name);
|
|
}
|
|
|
|
int __iio_add_chan_devattr(const char *postfix,
|
|
struct iio_chan_spec const *chan,
|
|
ssize_t (*readfunc)(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf),
|
|
ssize_t (*writefunc)(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf,
|
|
size_t len),
|
|
u64 mask,
|
|
bool generic,
|
|
struct device *dev,
|
|
struct list_head *attr_list)
|
|
{
|
|
int ret;
|
|
struct iio_dev_attr *iio_attr, *t;
|
|
|
|
iio_attr = kzalloc(sizeof *iio_attr, GFP_KERNEL);
|
|
if (iio_attr == NULL) {
|
|
ret = -ENOMEM;
|
|
goto error_ret;
|
|
}
|
|
ret = __iio_device_attr_init(&iio_attr->dev_attr,
|
|
postfix, chan,
|
|
readfunc, writefunc, generic);
|
|
if (ret)
|
|
goto error_iio_dev_attr_free;
|
|
iio_attr->c = chan;
|
|
iio_attr->address = mask;
|
|
list_for_each_entry(t, attr_list, l)
|
|
if (strcmp(t->dev_attr.attr.name,
|
|
iio_attr->dev_attr.attr.name) == 0) {
|
|
if (!generic)
|
|
dev_err(dev, "tried to double register : %s\n",
|
|
t->dev_attr.attr.name);
|
|
ret = -EBUSY;
|
|
goto error_device_attr_deinit;
|
|
}
|
|
list_add(&iio_attr->l, attr_list);
|
|
|
|
return 0;
|
|
|
|
error_device_attr_deinit:
|
|
__iio_device_attr_deinit(&iio_attr->dev_attr);
|
|
error_iio_dev_attr_free:
|
|
kfree(iio_attr);
|
|
error_ret:
|
|
return ret;
|
|
}
|
|
|
|
static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev,
|
|
struct iio_chan_spec const *chan)
|
|
{
|
|
int ret, i, attrcount = 0;
|
|
|
|
if (chan->channel < 0)
|
|
return 0;
|
|
|
|
ret = __iio_add_chan_devattr(iio_data_type_name[chan->processed_val],
|
|
chan,
|
|
&iio_read_channel_info,
|
|
(chan->output ?
|
|
&iio_write_channel_info : NULL),
|
|
0,
|
|
0,
|
|
&indio_dev->dev,
|
|
&indio_dev->channel_attr_list);
|
|
if (ret)
|
|
goto error_ret;
|
|
attrcount++;
|
|
|
|
for_each_set_bit(i, &chan->info_mask, sizeof(long)*8) {
|
|
ret = __iio_add_chan_devattr(iio_chan_info_postfix[i/2],
|
|
chan,
|
|
&iio_read_channel_info,
|
|
&iio_write_channel_info,
|
|
i/2,
|
|
!(i%2),
|
|
&indio_dev->dev,
|
|
&indio_dev->channel_attr_list);
|
|
if (ret == -EBUSY && (i%2 == 0)) {
|
|
ret = 0;
|
|
continue;
|
|
}
|
|
if (ret < 0)
|
|
goto error_ret;
|
|
attrcount++;
|
|
}
|
|
ret = attrcount;
|
|
error_ret:
|
|
return ret;
|
|
}
|
|
|
|
static void iio_device_remove_and_free_read_attr(struct iio_dev *indio_dev,
|
|
struct iio_dev_attr *p)
|
|
{
|
|
kfree(p->dev_attr.attr.name);
|
|
kfree(p);
|
|
}
|
|
|
|
static ssize_t iio_show_dev_name(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct iio_dev *indio_dev = dev_get_drvdata(dev);
|
|
return sprintf(buf, "%s\n", indio_dev->name);
|
|
}
|
|
|
|
static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL);
|
|
|
|
static int iio_device_register_sysfs(struct iio_dev *indio_dev)
|
|
{
|
|
int i, ret = 0, attrcount, attrn, attrcount_orig = 0;
|
|
struct iio_dev_attr *p, *n;
|
|
struct attribute **attr;
|
|
|
|
/* First count elements in any existing group */
|
|
if (indio_dev->info->attrs) {
|
|
attr = indio_dev->info->attrs->attrs;
|
|
while (*attr++ != NULL)
|
|
attrcount_orig++;
|
|
}
|
|
attrcount = attrcount_orig;
|
|
/*
|
|
* New channel registration method - relies on the fact a group does
|
|
* not need to be initialized if it is name is NULL.
|
|
*/
|
|
INIT_LIST_HEAD(&indio_dev->channel_attr_list);
|
|
if (indio_dev->channels)
|
|
for (i = 0; i < indio_dev->num_channels; i++) {
|
|
ret = iio_device_add_channel_sysfs(indio_dev,
|
|
&indio_dev
|
|
->channels[i]);
|
|
if (ret < 0)
|
|
goto error_clear_attrs;
|
|
attrcount += ret;
|
|
}
|
|
|
|
if (indio_dev->name)
|
|
attrcount++;
|
|
|
|
indio_dev->chan_attr_group.attrs = kcalloc(attrcount + 1,
|
|
sizeof(indio_dev->chan_attr_group.attrs[0]),
|
|
GFP_KERNEL);
|
|
if (indio_dev->chan_attr_group.attrs == NULL) {
|
|
ret = -ENOMEM;
|
|
goto error_clear_attrs;
|
|
}
|
|
/* Copy across original attributes */
|
|
if (indio_dev->info->attrs)
|
|
memcpy(indio_dev->chan_attr_group.attrs,
|
|
indio_dev->info->attrs->attrs,
|
|
sizeof(indio_dev->chan_attr_group.attrs[0])
|
|
*attrcount_orig);
|
|
attrn = attrcount_orig;
|
|
/* Add all elements from the list. */
|
|
list_for_each_entry(p, &indio_dev->channel_attr_list, l)
|
|
indio_dev->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr;
|
|
if (indio_dev->name)
|
|
indio_dev->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr;
|
|
|
|
indio_dev->groups[indio_dev->groupcounter++] =
|
|
&indio_dev->chan_attr_group;
|
|
|
|
return 0;
|
|
|
|
error_clear_attrs:
|
|
list_for_each_entry_safe(p, n,
|
|
&indio_dev->channel_attr_list, l) {
|
|
list_del(&p->l);
|
|
iio_device_remove_and_free_read_attr(indio_dev, p);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void iio_device_unregister_sysfs(struct iio_dev *indio_dev)
|
|
{
|
|
|
|
struct iio_dev_attr *p, *n;
|
|
|
|
list_for_each_entry_safe(p, n, &indio_dev->channel_attr_list, l) {
|
|
list_del(&p->l);
|
|
iio_device_remove_and_free_read_attr(indio_dev, p);
|
|
}
|
|
kfree(indio_dev->chan_attr_group.attrs);
|
|
}
|
|
|
|
static const char * const iio_ev_type_text[] = {
|
|
[IIO_EV_TYPE_THRESH] = "thresh",
|
|
[IIO_EV_TYPE_MAG] = "mag",
|
|
[IIO_EV_TYPE_ROC] = "roc",
|
|
[IIO_EV_TYPE_THRESH_ADAPTIVE] = "thresh_adaptive",
|
|
[IIO_EV_TYPE_MAG_ADAPTIVE] = "mag_adaptive",
|
|
};
|
|
|
|
static const char * const iio_ev_dir_text[] = {
|
|
[IIO_EV_DIR_EITHER] = "either",
|
|
[IIO_EV_DIR_RISING] = "rising",
|
|
[IIO_EV_DIR_FALLING] = "falling"
|
|
};
|
|
|
|
static ssize_t iio_ev_state_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf,
|
|
size_t len)
|
|
{
|
|
struct iio_dev *indio_dev = dev_get_drvdata(dev);
|
|
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
|
|
int ret;
|
|
bool val;
|
|
|
|
ret = strtobool(buf, &val);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = indio_dev->info->write_event_config(indio_dev,
|
|
this_attr->address,
|
|
val);
|
|
return (ret < 0) ? ret : len;
|
|
}
|
|
|
|
static ssize_t iio_ev_state_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct iio_dev *indio_dev = dev_get_drvdata(dev);
|
|
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
|
|
int val = indio_dev->info->read_event_config(indio_dev,
|
|
this_attr->address);
|
|
|
|
if (val < 0)
|
|
return val;
|
|
else
|
|
return sprintf(buf, "%d\n", val);
|
|
}
|
|
|
|
static ssize_t iio_ev_value_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct iio_dev *indio_dev = dev_get_drvdata(dev);
|
|
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
|
|
int val, ret;
|
|
|
|
ret = indio_dev->info->read_event_value(indio_dev,
|
|
this_attr->address, &val);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return sprintf(buf, "%d\n", val);
|
|
}
|
|
|
|
static ssize_t iio_ev_value_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf,
|
|
size_t len)
|
|
{
|
|
struct iio_dev *indio_dev = dev_get_drvdata(dev);
|
|
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
|
|
unsigned long val;
|
|
int ret;
|
|
|
|
if (!indio_dev->info->write_event_value)
|
|
return -EINVAL;
|
|
|
|
ret = strict_strtoul(buf, 10, &val);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = indio_dev->info->write_event_value(indio_dev, this_attr->address,
|
|
val);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return len;
|
|
}
|
|
|
|
static int iio_device_add_event_sysfs(struct iio_dev *indio_dev,
|
|
struct iio_chan_spec const *chan)
|
|
{
|
|
int ret = 0, i, attrcount = 0;
|
|
u64 mask = 0;
|
|
char *postfix;
|
|
if (!chan->event_mask)
|
|
return 0;
|
|
|
|
for_each_set_bit(i, &chan->event_mask, sizeof(chan->event_mask)*8) {
|
|
postfix = kasprintf(GFP_KERNEL, "%s_%s_en",
|
|
iio_ev_type_text[i/IIO_EV_DIR_MAX],
|
|
iio_ev_dir_text[i%IIO_EV_DIR_MAX]);
|
|
if (postfix == NULL) {
|
|
ret = -ENOMEM;
|
|
goto error_ret;
|
|
}
|
|
if (chan->modified)
|
|
mask = IIO_MOD_EVENT_CODE(chan->type, 0, chan->channel,
|
|
i/IIO_EV_DIR_MAX,
|
|
i%IIO_EV_DIR_MAX);
|
|
else if (chan->differential)
|
|
mask = IIO_EVENT_CODE(chan->type,
|
|
0, 0,
|
|
i%IIO_EV_DIR_MAX,
|
|
i/IIO_EV_DIR_MAX,
|
|
0,
|
|
chan->channel,
|
|
chan->channel2);
|
|
else
|
|
mask = IIO_UNMOD_EVENT_CODE(chan->type,
|
|
chan->channel,
|
|
i/IIO_EV_DIR_MAX,
|
|
i%IIO_EV_DIR_MAX);
|
|
|
|
ret = __iio_add_chan_devattr(postfix,
|
|
chan,
|
|
&iio_ev_state_show,
|
|
iio_ev_state_store,
|
|
mask,
|
|
0,
|
|
&indio_dev->dev,
|
|
&indio_dev->event_interface->
|
|
dev_attr_list);
|
|
kfree(postfix);
|
|
if (ret)
|
|
goto error_ret;
|
|
attrcount++;
|
|
postfix = kasprintf(GFP_KERNEL, "%s_%s_value",
|
|
iio_ev_type_text[i/IIO_EV_DIR_MAX],
|
|
iio_ev_dir_text[i%IIO_EV_DIR_MAX]);
|
|
if (postfix == NULL) {
|
|
ret = -ENOMEM;
|
|
goto error_ret;
|
|
}
|
|
ret = __iio_add_chan_devattr(postfix, chan,
|
|
iio_ev_value_show,
|
|
iio_ev_value_store,
|
|
mask,
|
|
0,
|
|
&indio_dev->dev,
|
|
&indio_dev->event_interface->
|
|
dev_attr_list);
|
|
kfree(postfix);
|
|
if (ret)
|
|
goto error_ret;
|
|
attrcount++;
|
|
}
|
|
ret = attrcount;
|
|
error_ret:
|
|
return ret;
|
|
}
|
|
|
|
static inline void __iio_remove_event_config_attrs(struct iio_dev *indio_dev)
|
|
{
|
|
struct iio_dev_attr *p, *n;
|
|
list_for_each_entry_safe(p, n,
|
|
&indio_dev->event_interface->
|
|
dev_attr_list, l) {
|
|
kfree(p->dev_attr.attr.name);
|
|
kfree(p);
|
|
}
|
|
}
|
|
|
|
static inline int __iio_add_event_config_attrs(struct iio_dev *indio_dev)
|
|
{
|
|
int j, ret, attrcount = 0;
|
|
|
|
INIT_LIST_HEAD(&indio_dev->event_interface->dev_attr_list);
|
|
/* Dynically created from the channels array */
|
|
for (j = 0; j < indio_dev->num_channels; j++) {
|
|
ret = iio_device_add_event_sysfs(indio_dev,
|
|
&indio_dev->channels[j]);
|
|
if (ret < 0)
|
|
goto error_clear_attrs;
|
|
attrcount += ret;
|
|
}
|
|
return attrcount;
|
|
|
|
error_clear_attrs:
|
|
__iio_remove_event_config_attrs(indio_dev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static bool iio_check_for_dynamic_events(struct iio_dev *indio_dev)
|
|
{
|
|
int j;
|
|
|
|
for (j = 0; j < indio_dev->num_channels; j++)
|
|
if (indio_dev->channels[j].event_mask != 0)
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
static void iio_setup_ev_int(struct iio_event_interface *ev_int)
|
|
{
|
|
mutex_init(&ev_int->event_list_lock);
|
|
/* discussion point - make this variable? */
|
|
ev_int->max_events = 10;
|
|
ev_int->current_events = 0;
|
|
INIT_LIST_HEAD(&ev_int->det_events);
|
|
init_waitqueue_head(&ev_int->wait);
|
|
}
|
|
|
|
static const char *iio_event_group_name = "events";
|
|
static int iio_device_register_eventset(struct iio_dev *indio_dev)
|
|
{
|
|
struct iio_dev_attr *p;
|
|
int ret = 0, attrcount_orig = 0, attrcount, attrn;
|
|
struct attribute **attr;
|
|
|
|
if (!(indio_dev->info->event_attrs ||
|
|
iio_check_for_dynamic_events(indio_dev)))
|
|
return 0;
|
|
|
|
indio_dev->event_interface =
|
|
kzalloc(sizeof(struct iio_event_interface), GFP_KERNEL);
|
|
if (indio_dev->event_interface == NULL) {
|
|
ret = -ENOMEM;
|
|
goto error_ret;
|
|
}
|
|
|
|
iio_setup_ev_int(indio_dev->event_interface);
|
|
if (indio_dev->info->event_attrs != NULL) {
|
|
attr = indio_dev->info->event_attrs->attrs;
|
|
while (*attr++ != NULL)
|
|
attrcount_orig++;
|
|
}
|
|
attrcount = attrcount_orig;
|
|
if (indio_dev->channels) {
|
|
ret = __iio_add_event_config_attrs(indio_dev);
|
|
if (ret < 0)
|
|
goto error_free_setup_event_lines;
|
|
attrcount += ret;
|
|
}
|
|
|
|
indio_dev->event_interface->group.name = iio_event_group_name;
|
|
indio_dev->event_interface->group.attrs = kcalloc(attrcount + 1,
|
|
sizeof(indio_dev->event_interface->group.attrs[0]),
|
|
GFP_KERNEL);
|
|
if (indio_dev->event_interface->group.attrs == NULL) {
|
|
ret = -ENOMEM;
|
|
goto error_free_setup_event_lines;
|
|
}
|
|
if (indio_dev->info->event_attrs)
|
|
memcpy(indio_dev->event_interface->group.attrs,
|
|
indio_dev->info->event_attrs->attrs,
|
|
sizeof(indio_dev->event_interface->group.attrs[0])
|
|
*attrcount_orig);
|
|
attrn = attrcount_orig;
|
|
/* Add all elements from the list. */
|
|
list_for_each_entry(p,
|
|
&indio_dev->event_interface->dev_attr_list,
|
|
l)
|
|
indio_dev->event_interface->group.attrs[attrn++] =
|
|
&p->dev_attr.attr;
|
|
indio_dev->groups[indio_dev->groupcounter++] =
|
|
&indio_dev->event_interface->group;
|
|
|
|
return 0;
|
|
|
|
error_free_setup_event_lines:
|
|
__iio_remove_event_config_attrs(indio_dev);
|
|
kfree(indio_dev->event_interface);
|
|
error_ret:
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void iio_device_unregister_eventset(struct iio_dev *indio_dev)
|
|
{
|
|
if (indio_dev->event_interface == NULL)
|
|
return;
|
|
__iio_remove_event_config_attrs(indio_dev);
|
|
kfree(indio_dev->event_interface->group.attrs);
|
|
kfree(indio_dev->event_interface);
|
|
}
|
|
|
|
static void iio_dev_release(struct device *device)
|
|
{
|
|
struct iio_dev *indio_dev = container_of(device, struct iio_dev, dev);
|
|
cdev_del(&indio_dev->chrdev);
|
|
if (indio_dev->modes & INDIO_BUFFER_TRIGGERED)
|
|
iio_device_unregister_trigger_consumer(indio_dev);
|
|
iio_device_unregister_eventset(indio_dev);
|
|
iio_device_unregister_sysfs(indio_dev);
|
|
}
|
|
|
|
static struct device_type iio_dev_type = {
|
|
.name = "iio_device",
|
|
.release = iio_dev_release,
|
|
};
|
|
|
|
struct iio_dev *iio_allocate_device(int sizeof_priv)
|
|
{
|
|
struct iio_dev *dev;
|
|
size_t alloc_size;
|
|
|
|
alloc_size = sizeof(struct iio_dev);
|
|
if (sizeof_priv) {
|
|
alloc_size = ALIGN(alloc_size, IIO_ALIGN);
|
|
alloc_size += sizeof_priv;
|
|
}
|
|
/* ensure 32-byte alignment of whole construct ? */
|
|
alloc_size += IIO_ALIGN - 1;
|
|
|
|
dev = kzalloc(alloc_size, GFP_KERNEL);
|
|
|
|
if (dev) {
|
|
dev->dev.groups = dev->groups;
|
|
dev->dev.type = &iio_dev_type;
|
|
dev->dev.bus = &iio_bus_type;
|
|
device_initialize(&dev->dev);
|
|
dev_set_drvdata(&dev->dev, (void *)dev);
|
|
mutex_init(&dev->mlock);
|
|
|
|
dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL);
|
|
if (dev->id < 0) {
|
|
/* cannot use a dev_err as the name isn't available */
|
|
printk(KERN_ERR "Failed to get id\n");
|
|
kfree(dev);
|
|
return NULL;
|
|
}
|
|
dev_set_name(&dev->dev, "iio:device%d", dev->id);
|
|
}
|
|
|
|
return dev;
|
|
}
|
|
EXPORT_SYMBOL(iio_allocate_device);
|
|
|
|
void iio_free_device(struct iio_dev *dev)
|
|
{
|
|
if (dev) {
|
|
ida_simple_remove(&iio_ida, dev->id);
|
|
kfree(dev);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(iio_free_device);
|
|
|
|
/**
|
|
* iio_chrdev_open() - chrdev file open for buffer access and ioctls
|
|
**/
|
|
static int iio_chrdev_open(struct inode *inode, struct file *filp)
|
|
{
|
|
struct iio_dev *indio_dev = container_of(inode->i_cdev,
|
|
struct iio_dev, chrdev);
|
|
filp->private_data = indio_dev;
|
|
|
|
return iio_chrdev_buffer_open(indio_dev);
|
|
}
|
|
|
|
/**
|
|
* iio_chrdev_release() - chrdev file close buffer access and ioctls
|
|
**/
|
|
static int iio_chrdev_release(struct inode *inode, struct file *filp)
|
|
{
|
|
iio_chrdev_buffer_release(container_of(inode->i_cdev,
|
|
struct iio_dev, chrdev));
|
|
return 0;
|
|
}
|
|
|
|
/* Somewhat of a cross file organization violation - ioctls here are actually
|
|
* event related */
|
|
static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct iio_dev *indio_dev = filp->private_data;
|
|
int __user *ip = (int __user *)arg;
|
|
int fd;
|
|
|
|
if (cmd == IIO_GET_EVENT_FD_IOCTL) {
|
|
fd = iio_event_getfd(indio_dev);
|
|
if (copy_to_user(ip, &fd, sizeof(fd)))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
|
|
static const struct file_operations iio_buffer_fileops = {
|
|
.read = iio_buffer_read_first_n_outer_addr,
|
|
.release = iio_chrdev_release,
|
|
.open = iio_chrdev_open,
|
|
.poll = iio_buffer_poll_addr,
|
|
.owner = THIS_MODULE,
|
|
.llseek = noop_llseek,
|
|
.unlocked_ioctl = iio_ioctl,
|
|
.compat_ioctl = iio_ioctl,
|
|
};
|
|
|
|
int iio_device_register(struct iio_dev *indio_dev)
|
|
{
|
|
int ret;
|
|
|
|
/* configure elements for the chrdev */
|
|
indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), indio_dev->id);
|
|
|
|
ret = iio_device_register_sysfs(indio_dev);
|
|
if (ret) {
|
|
dev_err(indio_dev->dev.parent,
|
|
"Failed to register sysfs interfaces\n");
|
|
goto error_ret;
|
|
}
|
|
ret = iio_device_register_eventset(indio_dev);
|
|
if (ret) {
|
|
dev_err(indio_dev->dev.parent,
|
|
"Failed to register event set\n");
|
|
goto error_free_sysfs;
|
|
}
|
|
if (indio_dev->modes & INDIO_BUFFER_TRIGGERED)
|
|
iio_device_register_trigger_consumer(indio_dev);
|
|
|
|
ret = device_add(&indio_dev->dev);
|
|
if (ret < 0)
|
|
goto error_unreg_eventset;
|
|
cdev_init(&indio_dev->chrdev, &iio_buffer_fileops);
|
|
indio_dev->chrdev.owner = indio_dev->info->driver_module;
|
|
ret = cdev_add(&indio_dev->chrdev, indio_dev->dev.devt, 1);
|
|
if (ret < 0)
|
|
goto error_del_device;
|
|
return 0;
|
|
|
|
error_del_device:
|
|
device_del(&indio_dev->dev);
|
|
error_unreg_eventset:
|
|
iio_device_unregister_eventset(indio_dev);
|
|
error_free_sysfs:
|
|
iio_device_unregister_sysfs(indio_dev);
|
|
error_ret:
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(iio_device_register);
|
|
|
|
void iio_device_unregister(struct iio_dev *indio_dev)
|
|
{
|
|
device_unregister(&indio_dev->dev);
|
|
}
|
|
EXPORT_SYMBOL(iio_device_unregister);
|
|
subsys_initcall(iio_init);
|
|
module_exit(iio_exit);
|
|
|
|
MODULE_AUTHOR("Jonathan Cameron <jic23@cam.ac.uk>");
|
|
MODULE_DESCRIPTION("Industrial I/O core");
|
|
MODULE_LICENSE("GPL");
|